/FILENAME
       /NOFILENAME (default)

    When used in conjunction with the /HEADER qualifier, this
    qualifier specifies that the filename should be included in the
    MIME headers generated. Only the name and extension portion of
    the file specification will be used; any node, device, directory,
    and version number information will be discarded. This qualifier
    does not specify the input file to use; only the name to use
    for the name parameter of the Content-type: header line and the
    filename parameter of the Content-disposition: header line. By
    default, no filename parameter is specified in the Content-type:
    or Content-disposition: header lines.

    Or if used with /ENCODING=UUENCODE, the /FILENAME qualifier
    causes the filename to be included on the "begin 600" line.